Stormwater Symposium

Oral

397471 - Hydrologic and Water Quality Performance of a Permeable Pavement and Underground Cistern Treatment Train in Coastal Ohio

Tuesday, June 5
10:30 AM - 12:00 PM
Location: Greenway AB
Co-Authors: William Hunt, Raleigh, NC – North Carolina State University; Kristi Arend, Huron, OH – Ohio Department of Natural Resources

A permeable interlocking concrete pavement (PICP) parking lot and underground rainwater harvesting treatment train was constructed in Huron, OH. It was monitored for 13 months to determine its ability to reduce runoff volume, mitigate peak runoff rate, and reduce pollutants in parking lot stormwater runoff.
While stormwater stored in the cistern was never used, total runoff volume was reduced significantly by 27%, primarily due to exfiltration from the scarified soil beneath the permeable pavement, while minor exfiltration also occurred from a leak in the cistern. The treatment train increased storage within the watershed by about 0.2 inches, and on average did not produce outflow until 0.25 inches of rainfall occurred.
Significant and substantial reduction of TSS and turbidity (>96%) was observed, with the permeable pavement providing primary treatment (filtration, sedimentation) and the cistern contributing to final polishing (sedimentation). Because of this, significant and substantial (>40%) reduction of sediment-bound nutrient forms (TKN, ON, PBP, TP) and TN was observed. Nitrate reduction (>70%) in the treatment train (significant at α=0.10) appeared to be related to an anaerobic zone in water stored in the scarified soil beneath the permeable pavement, allowing denitrification to occur. Chloride concentrations increased significantly (30 fold) through the treatment train, perhaps from relic chloride from winter deicing operations. pH was buffered substantially by the permeable pavement (increase of 1-1.5 units) but re-acidification occurred in the cistern, perhaps driven by nitrification in the cistern which caused substantial export of NO2- from the treatment train. Concentrations of Cu, Pb, and Zn were not significantly affected by the treatment train, which is dissimilar to previous studies on permeable pavements.
This treatment train SCM appears promising for mitigation of the detrimental effects of stormwater runoff, particularly if a dedicated, year-round water use could be provided to drawdown the cistern between wet-weather events.

Ryan Winston, PhD, PE

Research Assistant Professor
Ohio State University

Dr. Ryan Winston is a Research Assistant Professor in the Department of Food, Agricultural, and Biological Engineering at the Ohio State University. For the past decade, his research has focused on hydrologic and water quality improvements provided by Low Impact Development (LID) strategies, with particular interests in bioretention, permeable pavement, and highway runoff management. Recently, much of his work is related to utilizing Low Impact Development in the municipal right-of-way to reduce sanitary sewer overflows. Over the past ten years, Ryan has published 29 peer-reviewed journal articles, instructed several college courses, and taught over 100 workshops related to stormwater management to professionals. These include several international workshops, including one in Singapore and another in Nanjing, China. Ryan is a Professional Engineer in both Ohio and North Carolina. He has much engineering design experience related to LID, and has designed, installed, and monitored (for research purposes) stormwater controls in six U.S. states. He also has experience in construction observation/supervision and maintenance of LID practices.

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